kea-hook-runscript/examples/slash32_leases/kea-dhcp4.conf

{
"Dhcp4":
{
  "interfaces-config": {
    "interfaces": [ "eth0" ]
  },

  "hooks-libraries": [
    {
      "library": "/path/to/kea-hook-runscript/kea-hook-runscript.so",
      "parameters": {
        "script": "/path/to/script.sh"
      }
    }
  ],

  "lease-database": {
    "type": "memfile"
  },

  /* Option 121 definition */
  "option-def": [
         {
              "name": "rfc3442-classless-static-routes",
              "code": 121,
              "space": "dhcp4",
              "type": "record",
              "array": false,
              /* This is not a general option 121, it is specific to this usage with two routes: */
              /* Subnet length of destination1 (32), destination1 (X/32), router1,    destination2 (0/0), router2 */
              "record-types": "uint8, ipv4-address, ipv4-address,                    uint8, ipv4-address"
    }
  ],


  /* Only use client MAC address, not Client ID */
  "match-client-id": false,

  /* Set short lifetime, so that routes are removed from the kernel shortly after
     a client leaves the network without sending a DHCPRELEASE. */
  "valid-lifetime": 300,
  "renew-timer": 220,
  "rebind-timer": 220,

  "host-reservation-identifiers": ["hw-address"],
  "subnet4": [
  {
    /* Hack so that Kea hands out addresses in /32 subnets */
    "subnet": "0.0.0.0/32",

    /* Send appropriate routes to the client (you should adapt this, see README) */
    "option-data": [
        {
          "name": "rfc3442-classless-static-routes",
           /*       10.250.250.1/32 via 0.0.0.0,   0/0 via 10.250.250.1 */
           "data": "32, 10.250.250.1, 0.0.0.0,     0, 10.250.250.1"
        }
    ],

    "interface": "eth0",
    "reservation-mode": "out-of-pool",
    /* IP addresses reserved for clients, can be any /32 address. */
    "reservations": [
         {
             "hw-address": "96:ec:f8:ac:d8:bf",
             "ip-address": "192.0.2.201"
         },
         {
             "hw-address": "aa:bb:cc:dd:ee:ff",
             "ip-address": "203.0.113.12"
         }
    ]
  }
  ]
},

"Logging":
{
  "loggers": [
    {
      "name": "kea-dhcp4",
      "output_options": [
          {
            "output": "stdout"
            #"output": "/var/log/kea-dhcp4.log"
          }
      ],
      "severity": "DEBUG",
      "debuglevel": 0
    }
  ]
}

}